| 摘要 |
A messaging node, a memory, and methods for optimised message counting are provided. A data structure is held in a memory such as a RAM, and as messages are received in the node, they are assigned an expiry time and a state. Upon receipt of such message, a variation associated with the state and the expiry time is incremented to show that the message is in the new state. As a message changes to a new state, the variation associated with the original state is decremented, while the one associated with the new state is increment ed. Periodically, the content of the RAM data structure is moved to a file of the file system, thus providing for the construction of a file storing a sequence of variations, for each state, and associated with various time expiries. The content of the file can be read by taking into account only entries which expiry time has not yet expired, and the variations stored therein may be added, for each state and for each expiry time, to get a full count of the messages of the system. |
